How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

mathiaso — Thu, 30 Jan 2025 13:19:14 GMT

You're welcome. 🙂

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

Ziyao Zhou — Thu, 30 Jan 2025 12:01:48 GMT

Thank you so much for your suggestion! 😀

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

mathiaso — Thu, 30 Jan 2025 12:00:19 GMT

This is something you would have to implement yourself. But for, e.g., Bluetooth, the HCI Power Control sample, might be a place to start looking.

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

Ziyao Zhou — Thu, 30 Jan 2025 11:25:44 GMT

Thank you for your reply! Is there any code that allows TX side adjust it's TX power dynamically?

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

mathiaso — Thu, 30 Jan 2025 10:25:42 GMT

I understand this as you are looking for firmware adjusting the TX power to maintain the RSSI level on the RX side at a stable level. I'm afraid we don't have any code doing this. Sorry about that.

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

Ziyao Zhou — Wed, 29 Jan 2025 06:48:54 GMT

Dear Mathias,

I still got another question. Do you know any code negotiate RX and TX power to keep RX RSSI keep at the same level?

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

mathiaso — Fri, 24 Jan 2025 08:25:06 GMT

No worries! You're welcome.

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

Ziyao Zhou — Fri, 24 Jan 2025 02:12:31 GMT

Thank you so much for your help!

RE: How to adjust TX power and RX gain for nRF21540 EK+nRF52833 DK

mathiaso — Thu, 23 Jan 2025 14:39:28 GMT

Hi.

It is possible to change the TX gain either through SPI or the MODE pin. The RX gain is fixed at +13 dB.

You might find the answers in these tickets helpful:

Best regards,
Mathias